Re: [DML] Re: Re-wire of fan relay for A/C "ON" condition
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Re: [DML] Re: Re-wire of fan relay for A/C "ON" condition

Hi Lee,

Keep in mind that as designed, the fans should NOT always run when the A/C is 
on.  They should only run when the compressor clutch is activating the 
compressor.  As a result, your cooling fans will cycle in rhythm with your A/C 
compressor.  It's also noteworthy that once you are going about 30-35 MPH, the 
fans have no real function because there is already enough air coming across the 

As for the wiring, it's wired in a manner of "who gets there first".  Either the 
wires from the otterstat will trip the fan relay module to turn on, or the A/C 
clutch wire.  The wire is pink as it connects to the compressor, and 
black/orange by the time it connects to the fan relay in the relay compartment.

There is one other thing to check: I fixed a suddenly broken A/C system for an 
owner at DCS last year by tracing it to a dirty/loose connection at the bulkhead 
connector.  A failure there will drive you crazy because you take for granted 
that the signal is making it to the inside of the car.  Reading your symptoms, I 
would almost bet your compressor isn't cycling either.

Getting a good wiring diagram will make this a breeze for your electrical 
engineer friend.

Jake Kamphoefner

From: Lee <edmonson60@xxxxxxxxx>
To: dmcnews@xxxxxxxxxxxxxxx
Sent: Thu, March 24, 2011 9:17:41 AM
Subject: [DML] Re: Re-wire of fan relay for A/C "ON" condition

I am pretty certain that the only PO modification was the new in-line relay to 
the fans, making them run 100% of the time. This was repaired by my non-color 
blind friend when he put the Joe Cool in for me. ( He is an electrical engineer 
and I am certain he got it right)

Becasue I live on the coast of Oregon, I rarely turn on my air conditioner and 
did not realize how important it is to have the fans run to get cold air out of 
the vents until I drove up to Bellevue, WA to have Toby Peterson do some work 
last summer. It got way too toasty on the 6 hour drive home!

So now with the Joe Cool installed the fans cycle when the otterstat sends a 
signal, but only then and not when the A/C is switched on unless the otterstat 
tells them to.

To identify the wire from the A/C compressor that needs to be reconnected to the 
fan relay can I just take the "left over" wires one at a time and check them 
with a meter as I turn on the A/C?

Lee Edmonson

--- In dmcnews@xxxxxxxxxxxxxxx, "daveswingle2" <swingle_dmc@...> wrote:
> Sinple things first. Make sure he didn't just put a jumper across the otterstat 
>wire in the engine compartment. 
> Dave S - DMC Midwest

[Non-text portions of this message have been removed]


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